Have just come across this little gem called "Rate My Teachers". The site says that "in the public discourse on improving education, we believe the most important voices [students] are often ignored". They thus provide an outlet for studenst and parents to rate how good they actually think their teachers are.
Who needs Oftsed when you can have a vindictive child with a hate complex? If anyone reading this is a teacher do let me know if you've been rated.